I thought the Arduino SCK (D52) must be routed to SCK of the MCP3204?If i swap them "Arduinos SCK" goes to "CS of MCP3204" and "CLK of MCP3204" to a digital pin of the Arduino?
If a +5V supply is used, an external +5V reference is required in order to provide full dynamic range for a 0V to +Vdd analog input.
The GND pin should be connected to a clean ground point. In many cases, this will be the "analog" ground.Avoid connections that are too near the grounding point of a microcontroller or digital signal processor.The ideal layout will include an analog ground plane dedicated to the converter and associated analogcircuitry.
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